Comparison of experimental and numerical correction factors from seam weld fracture energy by drop weight tear testing of gas transportation pipelines

Document Type : Original Article

Authors

1 Department of Mechanical Engineering, Payame Noor University, Tehran, Iran

2 Department of Mechanical Engineering, University of Birjand, Iran

3 Department of Mechanical Engineering, Vali–e–Asr University of Rafsanjan, Rafsanjan, Iran

Abstract

In addition to non-destructive testing, the weld joints in large structures must also be confirmed by mechanical destructive testing (such as tensile and impact tests). Drop weight tear test (DWTT) is a reliable test to evaluate ductile fracture and crack arrestability of pipelines. Previous research has focused on measuring and comparing the base metal fracture energy from DWTT using finite element and experimental methods. However, in the present research, the spirally welded seam of API X65 steel specimens were machined from an actual pipe and tested using DWTT. The load-displacement curves obtained from both numerical and experimental methods have been evaluated and compared regarding correction factors. Using the obtained correction factors (from important characteristics of the load-displacement curve such as total absorbed energy, crack initiation and propagation energy are used), the load-displacement curve of simulation can be relied upon with acceptable accuracy. Real curves can be obtained with a relatively large amount of time and money. For the steel used in the present study, the correction factor for base and weld metal is 1.8. The use of this value will also be acceptable for steels of the same grade. The weld metal correction factor using the simulation (based on Gurson-Tvergaard-needleman method) was 1.7, which was slightly different from the experimental value.

Keywords

References

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Iranian Journal of Manufacturing Engineering
Volume 9, Issue 3
June 2022
Pages 29-37

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